How To Dry Oily Coffee Beans – Tips & Trips

how to dry oily coffee beans - coffee culture thailand

What To Do & How To Dry Oily Coffee Beans

If you’re a coffee lover, you know that freshly roasted coffee beans are the way to go for the best tasting cup of joe. However, sometimes you may end up with a bag of oily coffee beans. Oily coffee beans can be caused by a variety of factor. Including improper storage or a high level of humidity in the roasting process or as simple as the roast level of the coffees. Whatever the cause, if you find yourself with a bag of oily beans, don’t despair – there are ways to dry them out and restore your coffee beans.

The biggest concern with oily beans is the damage they can cause to semi-automatic or super-automatic coffee machines. These coffee machines have been designed to do everything from grinding to brewing in one go. A really convenient machine, but if you are a person who enjoys dark or french roast coffee, it can cause quite a complication for your machines. Oil creates layers of greasy gunk on all parts of your automatic coffee machines. Eventually, your coffee maker will become sluggish, and eventually will need to send it either for service or to a coffee machine repair shop. So, if you find yourself with a bag of oily coffee beans, don’t give up on them just yet. With a little patience and some careful drying techniques, you can restore your oily coffee beans and enjoy a delicious cup of coffee. So let’s jump right in. 

Why Coffee Beans Become Oily

There are several reasons why coffee beans may become oily. The most common cause is the roasting process, as dark roast coffee tends to draw more lipids to the surface of the beans, making them appear and feel oily. Additionally, the roasting process causes CO2 to escape the beans, which reacts with oxygen and forms an oil. This oxidation process continues even after the beans have finished roasting, causing old beans to become oily as well.

Another factor that can contribute to oily coffee beans is improper storage. If the beans are stored in a warm, humid environment, they may begin to sweat, leading to an oily appearance. However, it’s important to note that moist beans are different from oily beans, as they are more prone to spoilage and can produce a poor-tasting brew.

To avoid oily coffee beans, it’s important to store them in an airtight container in a cool, dry place. Additionally, purchasing whole beans rather than pre-ground coffee can help to preserve their freshness, as ground coffee has a larger surface area and is more prone to becoming stale or oily.

The Best Way To Dry Oily Coffee Beans

There are a number of ways and techniques to dry your oily coffee beans. Below we will go over a couple of methods, so we hope you find them helpful. 

1. MIX WITH A LIGHTER ROAST. One effective way to dry out oily coffee beans is to mix them with a lighter roast. Simply place the beans in an airtight ceramic container and give the container a good swirl to evenly distribute the oils. Over time, the lighter roast beans will absorb some of the oil from the oily dark roast beans. Resulting in a more evenly balanced level of oiliness.

2. BAKE THEM IN AN OVEN. If you have an oven at home. You can spread out your oily beans onto a baking sheet and place them in the oven at a low temperature (around 200-225 degrees Fahrenheit). Be sure to keep a close eye on the beans as they roast. As they can go from perfectly dried to burnt in a matter of minutes. Once the beans have reached your desired level of dryness, remove them from the oven and allow them to cool before brewing.

3. LET THEM DRY OUT NATURALLY. If you have some time to spare, place them in a single layer on a clean cloth or paper towel and allow them to air dry. This method may take a bit longer, but it allows you to monitor the dryness of the beans more closely and avoid the risk of burning them.

4. USE A FOOD DEHYDRATOR. If you’re in a hurry and don’t want to wait for your beans to dry out naturally. You can try using a food dehydrator. Simply place the beans in a single layer on the dehydrator tray. Then the temperature to a low setting (around 140-150 degrees Fahrenheit). Again, be sure to keep a close eye on the beans as they dehydrate to avoid burning them.

Avoid Using This Method To Dry Your Coffee Beans

Never rinse your coffee beans under a sink nor patting them dry with paper towels. This method will remove many of the delicious flavors and aroma in your coffee. The coffee brewed from this method will taste watery or hollow. Afterall, oils are naturally in coffee beans and are the very reason why your cup of coffee is so tasty. 


What The Preventive Measures To Prevent Coffee Beans From Turning Oil

There are several preventive measures you can take to avoid oily coffee beans.

  • In addition to these methods for drying out oily coffee beans. There are also steps you can take to prevent your beans from becoming oily in the first place. Proper storage is key – keep your beans in an airtight container in a cool, dry place to prevent humidity from affecting their freshness. Additionally, consider purchasing whole beans rather than pre-ground coffee, as ground coffee is more susceptible to becoming stale or oily due to its larger surface area.
  • It’s important to store the beans in a cool and dry place to prevent spoilage and maintain their freshness. An opaque container can also be helpful in preventing photodegradation caused by UV light.
  • It’s worth noting that this method may not completely eliminate the oiliness of the beans, but it’ll help reduce it. For the best results, make sure to use a light roast with a lower oil content than the dark roast beans. Overall, mixing oily coffee beans with a lighter roast is a simple and effective way to dry them out and improve their flavor.

Overall, the best way to prevent coffee beans from turning oily is to store them properly. Choose a roast with a lower oil content, and avoid using oily beans in semi-automatic or super-automatic coffee machines. By following these tips, you can enjoy fresh, flavorful coffee every time.

2 thoughts on “How To Dry Oily Coffee Beans – Tips & Trips

    • Chayutra Borvornpotsakul says:

      Hi Albert, the most ideal temperature for making an espresso is between 92 – 95 celsius. This will extract the best flavor from the coffee beans. So it’s best to get a thermometer for this.

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